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#include "slang-riff.h"
#include "../../slang-com-helper.h"
namespace Slang
{
/* static */int64_t RiffUtil::calcChunkTotalSize(const RiffChunk& chunk)
{
int64_t size = chunk.m_size + sizeof(RiffChunk);
return (size + 3) & ~int64_t(3);
}
/* static */SlangResult RiffUtil::skip(const RiffChunk& chunk, Stream* stream, int64_t* remainingBytesInOut)
{
int64_t chunkSize = calcChunkTotalSize(chunk);
if (remainingBytesInOut)
{
*remainingBytesInOut -= chunkSize;
}
// Skip the payload (we don't need to skip the Chunk because that was already read
stream->seek(SeekOrigin::Current, chunkSize - sizeof(RiffChunk));
return SLANG_OK;
}
/* static */SlangResult RiffUtil::readChunk(Stream* stream, RiffChunk& outChunk)
{
try
{
stream->read(&outChunk, sizeof(RiffChunk));
}
catch (IOException&)
{
return SLANG_FAIL;
}
// TODO(JS): Could handle endianness issues here...
return SLANG_OK;
}
/* static */SlangResult RiffUtil::writeData(const RiffChunk* header, size_t headerSize, const void* payload, size_t payloadSize, Stream* out)
{
SLANG_ASSERT(uint64_t(payloadSize) <= uint64_t(0xfffffffff));
SLANG_ASSERT(headerSize >= sizeof(RiffChunk));
SLANG_ASSERT((headerSize & 3) == 0);
// TODO(JS): Could handle endianness here
RiffChunk chunk;
chunk.m_type = header->m_type;
chunk.m_size = uint32_t(headerSize - sizeof(RiffChunk) + payloadSize);
try
{
// The chunk
out->write(&chunk, sizeof(RiffChunk));
// The rest of the header
out->write(header + 1, headerSize - sizeof(RiffChunk));
out->write(payload, payloadSize);
size_t remaining = payloadSize & 3;
if (remaining)
{
uint8_t end[4] = { 0, 0, 0, 0};
out->write(end, 4 - remaining);
}
}
catch (IOException&)
{
return SLANG_FAIL;
}
return SLANG_OK;
}
/* static */SlangResult RiffUtil::readData(Stream* stream, RiffChunk* outHeader, size_t headerSize, List<uint8_t>& data)
{
RiffChunk chunk;
SLANG_RETURN_ON_FAIL(readChunk(stream, chunk));
if (chunk.m_size < headerSize)
{
return SLANG_FAIL;
}
*outHeader = chunk;
try
{
// Read the header
stream->read(outHeader + 1, headerSize - sizeof(RiffChunk));
const size_t payloadSize = chunk.m_size - (headerSize - sizeof(RiffChunk));
data.setCount(payloadSize);
stream->read(data.getBuffer(), payloadSize);
// Skip to the alignment
uint32_t remaining = payloadSize & 3;
if (remaining)
{
stream->seek(SeekOrigin::Current, 4 - remaining);
}
}
catch (IOException&)
{
return SLANG_FAIL;
}
return SLANG_OK;
}
}
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